Improvement in steam-generators



A diluted ,Stat/e5 o ,MDM (tithe.

J'AMES HOWARD AND EDWARD TENNEY BOUSFIELD, OF BED-A u FORD, ENGLAND.

Letters Patent No. 90,450, dated May 25, 1869.

IMPROVEMENT IN STEAM-GENERATORS.

The Schedule referred tc in these Letters Patent and makingv part of the name.

To all whom 'it may concern:

the same;

Figure 3, Sheet I, is a plan or top view of the same;

Figure 4, Sheet II, is a front elevation, partly in section, of a modification of the same; l

Figure 5, Sheet II, is a detail side view of the same 5 Figure 6, Sheet II, is a detail vertical section, and

Figure 7, Sheet II, a detail end view of the same. Similar letters of reference indicate corresponding parts.

vThis invention relates to improvements on the vertical tubular boiler for which we obtained Letters Patent, dated October 23, 1866, and July 9, 1867 the main object of the present invention being to facilitate the removal from such boilers of the scum that is thrown up by the water employed in certain localities, to improve the connections between the vertical and horizontal tubes composing the boiler, and also to facilitate the detachment and removal of any one or more of the vertical tubes, when required. We have found, by experience, that s'ome waters, under ebullition, instead of affording a calcareous or other deposit,throw up a scum, which, if allowed to accumulate, would seriously interfere with the working of the engine supplied with steam from the boiler. This is particularly observable when using water derived from, or that has passed over a shale-bed.

When constructing boilers for districts yielding water of this description, we propose to divide the vertical tubes into 'two lengths, and to interpose between the upper and lower lengths additional horizontal tubes, at about the level of the `water-line, to the upper and lower sides of which the vertical tubes will be secured.

In Sheet I of the drawings, this arrangement is illustrated by groups of tubes in side elevation, end view, and plan view.

Thel vertical tubes are divided into two parts A A', by means of the horizontal tubes B, and they are connected at their lower ends by horizontal .tubes C, as heretofore, and at their upper ends bya novel arrangement of zigzag steam-pipes, D D. The horizontal tubes y B are placed side by'side, so as to come in contact however,

with cach other, to form a close division inthe heatingchamber,they thus serving the purpose of the plates heretofore used for returning the llame and heated gases to the front of the heating-chamber, and causing them to play on the upper parts of the vertical tubes. l

The ordinary water-level of the boiler will be on a level with the axes of these horizontal tubes B, and there will be fitted to the endl of each a scum-pipe, through which any foreign matter which iioats on the water can be cleared olf at pleasure.'

In manufacturing the convenient tocast the tubeB on to the half tubes A', by laying the latter in the mould, and 'thus to form the junctions in the mould.

` The same remark applies also to the connection o f the tubes C to their respective groups of half tubes A".

The upper halves A of the vertical tubes we propose to iix in a novel way to the 'horizontal tubes B. In order to simplify and improve the connection between the vertical. and horizontal tubes, which connectiou has heretofore been made by bolts passing through projecting lugs or anges on the vertical tubes, and tapped into nuts inserted in recesses at the sides of the horizontal tubes, we raise on the surface of the horizontal tubes conical-screwed nozzles, and form on the ends of the vertical tubes, a colresponding internal thread, which, 'tted on the nozzles, will make a water-tight joint not liable to be injuriously aifected by exposure in the heating-chamber.

This arrangement applies not only where the addii tional horizontal tubes B are used, but also tothetting of the` undivided vertical tubes to the water-supply tubes O.

This part of our invention is illustrated in figs. 4

vand 5, Sheet II, in end and side elevation, one of the vertical and horizontal tubes of the group shown in g. 4 being in section.

rJhese gures represent the tubes A as connected to cast-iron tubes C. In this case conical threadedI nozzles E are placed in the mould, and they are thus connected to the tube O in the act of casting.` When, the vertical tubes are to be connected to wrought-iron horizontal tubes, we prefer the arrangement shown in vertical section at iig. 6,'aud in end Y elevation at fig. 7

The horizontal tube is iiattened on its upper side, and tapped to receive double-coned' nozzles F, which have screw-threads cut thereon. The one screw-thread tits into the thread cut in the horizontal tube, andthe other receives the tapped end of the vertical tube A.

Then it is necessary to takeout, for the purpose of cleaning or otherwise, a vertical tube thus fitted, we apply heat to it externallyv to' expand it. A conven ient method is to use a heated ironV ring, lowered to groups of tubes, it will be lfrom the sections of Vertical tubes, l gether two rows or sections,

, flanges and secured by nuts.

of any tube being released 'from 'y tubes, that tube can be raised vertically outof its that part of the tube embracing the projecting nozzle. When the tube is expanded, a suitable wrench being r applied to the tube, will readily start it and disengage it from the horizontal tube.

As the nozzle rises above the horizontal tube, thev dirt is readily cleared from it, and the vertical tube can be replaced without the workman goinginto the furnace-chamber.

Still furthe-'r to facilitate the removal of the vertical tubes, we propose to dispense with the horizontal steampipes, which we have heretofore used to takethe steam and to couple toby means of a zigzag arrangement of short tubular pieces terminating in the main steam-pipe.

. This arrangement (see iig. 3) is composed of' flanged D, fitted one to each vertical tube, and connected together by screw-bolts passed through the rlhe connecting-piece those of the adjoining place without interfering with the surrounding tubes'.

When the vertical tubes are not divided toreceive the additional horizontal tubes for'collectingr the scum, which arrangement is required only in certain locali ties, as above indicated, horizontal dividing-plates will be used, as heretofore, for returning the {iame and heated gases to the front of the heatingchamben Instead, however, of making them pendent from rods, or providing transverse or longitudinal bars to carry them, lwe propose to form the tubes with enlargements at the proper level, shown at iig. 4, and thus to form shoulders-a a for supporting the division-plates G.

Having thus described our invention,

What we claim as new, and desire to secure by Letters Patent, is

l.l The construction and arrangement of the vertical and horizontal tubes, and the conical-screwed nozzles E and F, substantially as described.

2'. The zigzag pipes I), arranged-with reference each other, and the upper substantially asset forth.

3. The combination ofthe supports a, of the tubes A, and the division-'plates G, arranged with reference to the vertical pipes, substantially as herein described.

The above speciiication of our invention signed by us, this 2d day of February, 1869.

- J AMES 'HOVVARD.

EDVARD TENNEY BOUSF1ELD.-

to ends-of the vertical tubes,

fitnesses FRED. WALKDEN, 66 Chancery Lane, London. y M. WYNN,

24 Royal Exchange, London. 

